CN105417925A - Preparation method of sludge conditioning agent for deep dehydration of sludge - Google Patents
Preparation method of sludge conditioning agent for deep dehydration of sludge Download PDFInfo
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- CN105417925A CN105417925A CN201511004112.5A CN201511004112A CN105417925A CN 105417925 A CN105417925 A CN 105417925A CN 201511004112 A CN201511004112 A CN 201511004112A CN 105417925 A CN105417925 A CN 105417925A
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- sludge
- flocculating agent
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/001—Runoff or storm water
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a preparation method of a sludge conditioning agent for deep dehydration of sludge. The method comprises the following steps: adjusting the pH value of a silicate solution at normal temperature under normal pressure to 2-4 to make silicate become polysilicic acid, and mixing and stirring the polysilicic acid solution with an inorganic flocculating agent solution at 20-40DEG C according to a molar ratio of the polysilicic acid solution to the inorganic flocculating agent of 1:0.5-3 until uniformity in order to obtain the sludge conditioning agent for deep dehydration of sludge. Polyhydroxy metal salt is partially formed in the formation process of polysilicate-metal salt, and has a large convolution effect, and the convolution effect makes sludge floc be further increased; and the floc formed by the conditioning agent is dense, and water in the floc can be easily extruded out. The conditioning agent can be used in sludge with the water content of 95% or above, allows formed mud cakes to still have a high dehydration performance, and also can be used to treat sludge with the water content of 80%.
Description
Technical field
The present invention relates to a kind of preparation method of the sludge conditioner for deeply dehydrating sludge, belong to environmental engineering and technical field of sludge treatment.
Background technology
Municipal sludge refers to a part of residual active sludge that municipal sewage plant produces after biological sewage treatment, and " national environmental protection " 11th Five-Year " planning " is pointed out: the sewage treatment capacity of 2010 is 36,500,000,000 tons; Within 2015, sewage treatment capacity is 47,500,000,000 tons; If by often processing ten thousand tons of sewage, to produce 7.5 tons of water ratio be 80% residual active sludge (dehydration after mud cake), and China can produce 3512.5 ten thousand tons of residual active sludges for 2015.But the so huge mud of output is effectively addressed, the ratio disposed is but not high.According to statistics, safe and effectively can not process the dewatered sludge disposed and account for 70% of total amount.The feature of output huge every year and the difficult disposal environment hot issue that municipal sludge is suddenly become is domestic.
The mud that urban wastewater treatment firm produces in sewage treatment unit operating process is undertaken subtracting appearance, decrement, stable and harmless treatment by various treatment process.Sludge treatment technique unit mainly comprises the technological processs such as sludge condensation, dehydration, digestion (anaerobic digestion and aerobic sigestion), fermentation and mummification.But most of urban wastewater treatment firm is all that the mud of generation is become mud cake by press filtration after adding a large amount of cationic polyacrylamides and carrying out mechanical thickening, and the water ratio of mud cake is still up to about 80%.And the polymerization of cationic polyacrylamide makes mud flco form loose reticulated structure, flco inside still has large quantity of moisture to be difficult to discharge, and affects the process that mud is follow-up.
Mud usually needed deep dehydration before final process is disposed, and moisture percentage in sewage sludge is down to less than 50%.Conventional method has natural seasoning, heat source method and filter press technique.Although natural seasoning cost is lower, take a large amount of soils, and the smells such as stench cannot process; Heat source method cost and energy consumption higher, neither rational treatment process.Filter press technique can avoid above-mentioned shortcoming, but is the mud of 80% for water ratio, and especially include the mud of polyacrylamide, dehydrating effect is very poor, and under 3Mpa pressure, water ratio is declined by less than 5%.So be badly in need of one can meet mud primary dewatering again can not to the influential sludge conditioner of its deep dehydration.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of preparation method of the sludge conditioner for deeply dehydrating sludge.The present invention is with silicate, inorganic flocculating agent generation polymerization forms a kind of sludge conditioner having charge neutrality and adsorption bridging effect, its interaction energy makes mud flco form compact structure, can increase the ratio of mud free water and interstitial water, makes again internal moisture easily be forced out.Under 0.05Mpa pressure, moisture percentage in sewage sludge can reach 75% ~ 80% easily, if intensified pressure is to 2Mpa, moisture percentage in sewage sludge can drop to 60% ~ 55%.This product also can be used for process water ratio is simultaneously the mud of 80%, and under its conditioning, sewage water ratio can be down to 50%.Can use under the processing pressure of current sewage work, also can use under high pressures.Realize the minimizing of mud.Greatly reduce transportation cost and the process cost of disposal of mud outward transport.
Technical scheme of the present invention is as follows:
For a preparation method for the sludge conditioner of deeply dehydrating sludge, comprise step as follows:
1) at normal temperatures and pressures, regulate silicate solutions pH to 2 ~ 4, acidifying is carried out to silicate solutions, make silicate form polysilicon acid, stir after 3 ~ 8 minutes and leave standstill, obtain polysilicon acid solution;
2) get inorganic flocculating agent to be dissolved in water, stir after 3 ~ 8 minutes and leave standstill, obtained concentration is 1 ~ 2mol/L inorganic flocculating agent solution;
3) mixing and stirring at temperature 20 ~ 40 DEG C by polysilicon acid solution and inorganic flocculating agent solution, in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid solution and inorganic flocculating agent molar ratio are 1:0.5 ~ 3, obtain the sludge conditioner for deeply dehydrating sludge.
The present invention is preferred, step 1) described in the mass concentration of silicate solutions be 0.1 ~ 0.3mol/L, silicate solutions is sodium silicate solution or potassium silicate solution.
The present invention is preferred, step 1) under the stirring velocity of 200 ~ 400r/min, silicate solutions is joined in dilute hydrochloric acid solution or dilute sulphuric acid, make the pH value of mixing solutions be 2 ~ 3, then stop stirring reaction 5 ~ 20min, obtained polysilicon acid solution.
The present invention is preferred, step 2) in inorganic flocculating agent be one in molysite, aluminium salt, polymeric ferric salt, polyaluminium salts or polymeric aluminum molysite or any two kinds.
Preferred further, inorganic flocculating agent is iron(ic) chloride, aluminum chloride, polymerize aluminum chloride, poly-ferric chloride or aluminium iron polychloride.
The present invention is preferred, and in step (3), in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid solution and inorganic flocculating agent molar ratio are 1:1 ~ 2.5.
Highly preferred, in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid and inorganic flocculating agent molar ratio are 1:1 in step (3).
The present invention is preferred, and in step (3), mixing temperature is 30 ~ 38 DEG C.
The present invention is preferred, and in step (3), mixing time is 1 ~ 3h.
The application of the sludge conditioner that the present invention obtains, for sludge dewatering, described mud is primary sludge and/secondary sludge, and the water ratio of primary sludge is more than 95%, and the water ratio of secondary sludge is 70 ~ 95%.
The present invention is preferred, sludge conditioner of the present invention, during for sludge dewatering, method is as follows: at normal temperatures, in mud, add sludge conditioner, dosage is that every 100ml mud adds 6 ~ 12ml amendment, stirring reaction 10 ~ 60min, under pressure 0.05 ~ 2Mpa, carry out sludge dewatering, dehydration rate is 20% ~ 45%.
The present invention is preferred, and the dosage of amendment is that every 100ml mud adds 8ml amendment.
Sludge dehydrating agent conventional is on the market if cationic polyacrylamide is when for sludge dewatering, although the moisture percentage in sewage sludge formed has decline to a certain degree, but the mud cake internal structure formed is loose, when the effect when carrying out advanced treatment because of polyacrylamide, make internal moisture be difficult to deviate from, serve adverse effect.And this product is by adding polysilics acid metal salt, with the surface charge of mud granule on the one hand, utilize the polymerization of polysilicon acid that mud flco is increased further on the other hand, add in polysilics acid metal salt forming process and define part poly-hydroxy metal-salt, there is powerful convolution effect, its convolution effect is also that mud flco increases further, and the flco that this amendment is formed is more closely knit, and internal moisture easily extrudes.Not only may be used for the mud that water ratio is more than 95%, the mud cake formed still has higher dewatering, and can be used for process water ratio be the mud of 80%.
Accompanying drawing explanation
Fig. 1 is the influence curve figure of dosage to capillary water absorbing time of different sludge conditioner;
Fig. 2 is the influence curve figure of dosage to dehydration rate of different sludge conditioner.
Embodiment
Below by embodiment, the present invention will be further described, but be not limited thereto.
The raw material A lCl used in example
3, FeCl
3, NaSiO
3, sulfuric acid is commercial products
Pending primary sludge (water ratio is 98%) and secondary sludge (water ratio is 80%) take from the wide sewage work in Jinan.
Embodiment 1
For a preparation method for the sludge conditioner of deeply dehydrating sludge, comprise step as follows:
1) at normal temperatures and pressures, be that 0.3mol/L sodium silicate solution joins in dilute hydrochloric acid solution by concentration under the stirring velocity of 200r/min, make the pH value of mixing solutions be 2, then stop stirring reaction 10min, obtained polysilicon acid solution.
2) AlCl is got
3inorganic flocculating agent is dissolved in water, and stir after 5 minutes and leave standstill, obtained concentration is 1mol/LAlCl
3inorganic flocculating agent solution;
3) mixing and stirring at temperature 40 DEG C by polysilicon acid solution and inorganic flocculating agent solution, mixing time is 3h, water glass and AlCl
3molar ratio is 1:1, obtains the sludge conditioner for deeply dehydrating sludge.
Primary sludge (water ratio is 98%) is added after obtained product is left standstill 1h, every 100ml mud carries out press filtration after adding 8ml amendment mix and blend 10min under 0.05Mpa, and time of filter pressing is 20min, moisture percentage in sewage sludge is 78%, dehydration rate 20%.
Embodiment 2
For a preparation method for the sludge conditioner of deeply dehydrating sludge, comprise step as follows:
1) at normal temperatures and pressures, be that 0.3mol/L sodium silicate solution joins in dilute hydrochloric acid solution by concentration under the stirring velocity of 200r/min, make the pH value of mixing solutions be 3, then stop stirring reaction 10min, obtained polysilicon acid solution.
2) AlCl is got
3inorganic flocculating agent is dissolved in water, and stir after 5 minutes and leave standstill, obtained concentration is 1.5mol/LFeCl
3inorganic flocculating agent solution;
3) mixing and stirring at temperature 40 DEG C by polysilicon acid solution and inorganic flocculating agent solution, mixing time is 3h, water glass and FeCl
3molar ratio is 1:1, obtains the sludge conditioner for deeply dehydrating sludge.
Add secondary sludge (water ratio is 80%) after obtained product is left standstill 1h, every 100ml mud carries out press filtration after adding 8ml amendment mix and blend 20min under 2Mpa, and time of filter pressing is 20min, and moisture percentage in sewage sludge is 48%, dehydration rate 40%.
Embodiment 3
With the preparation method of the sludge conditioner for deeply dehydrating sludge described in embodiment 2, difference is:
Water glass and FeCl
3molar ratio is 1:0.5.
Embodiment 4
With the preparation method of the sludge conditioner for deeply dehydrating sludge described in embodiment 2, difference is:
Water glass and FeCl
3molar ratio is 1:1.5.
Embodiment 5
With the preparation method of the sludge conditioner for deeply dehydrating sludge described in embodiment 2, difference is:
Water glass and FeCl
3molar ratio is 1:2.
Embodiment 6
With the preparation method of the sludge conditioner for deeply dehydrating sludge described in embodiment 2, difference is:
Water glass and FeCl
3molar ratio is 1:2.5.
Embodiment 7
With the preparation method of the sludge conditioner for deeply dehydrating sludge described in embodiment 2, difference is:
Water glass and FeCl
3molar ratio is 1:3.
Application test:
Test example 1
Get the secondary sludge that water ratio is 80%, add in secondary sludge after the product that embodiment 2-7 is obtained is left standstill 1h, every 100ml mud carries out press filtration after adding 8ml amendment mix and blend 10min under 0.2Mpa, time of filter pressing is 20min, measures dehydration rate respectively.
Below different water glass and FeCl
3relation between mol ratio and dehydration rate, as shown in table 1:
The different water glass of table 1 and FeCl
3relation between mol ratio and dehydration rate
| Water glass and FeCl 3Mol ratio | Dehydration rate/% |
| 1：0.5 | 35 |
| 1：1 | 40 |
| 1：1.5 | 35 |
| 1：2 | 32 |
| 1：2.5 | 30 |
| 1：3 | 28 |
As can be seen from Table 1, in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid and inorganic flocculating agent mol ratio directly can affect and hold in the palm the tax rate, along with the increase of inorganic flocculating agent ratio, inhibit dewatering efficiency on the contrary, when the ratio of polysilicon acid is less than 1:1, dehydration rate is also less, can find out from upper table, when polysilicon acid and inorganic flocculating agent mol ratio are 1:1, dehydrating effect is best.
Test example 2
Get the primary sludge that water ratio is 98%, add in primary sludge after the product that embodiment 1 obtains is left standstill 1h, change the dosage of sludge conditioner, press filtration is carried out under 0.05Mpa, time of filter pressing is 20min, test capillary water absorbing time and dehydration rate respectively, the dosage of sludge conditioner on the impact of capillary water absorbing time and dehydration rate as shown in Figure 1, shown in Fig. 2.
As can be seen from Fig. 1, Fig. 2, along with the increase cst of dosage declines gradually, zeta also raises gradually, and moisture content of the cake declines gradually.
Claims (10)
1., for a preparation method for the sludge conditioner of deeply dehydrating sludge, comprise step as follows:
1) at normal temperatures and pressures, regulate silicate solutions pH to 2 ~ 4, acidifying is carried out to silicate solutions, make silicate form polysilicon acid, stir after 3 ~ 8 minutes and leave standstill, obtain polysilicon acid solution;
2) get inorganic flocculating agent to be dissolved in water, stir after 3 ~ 8 minutes and leave standstill, obtained concentration is 1 ~ 2mol/L inorganic flocculating agent solution;
3) mixing and stirring at temperature 20 ~ 40 DEG C by polysilicon acid solution and inorganic flocculating agent solution, in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid solution and inorganic flocculating agent molar ratio are 1:0.5 ~ 3, obtain the sludge conditioner for deeply dehydrating sludge.
2. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 1, it is characterized in that, step 1) described in the mass concentration of silicate solutions be 0.1 ~ 0.3mol/L, silicate solutions is sodium silicate solution or potassium silicate solution.
3. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 1, it is characterized in that, step 1) in silicate solutions is joined in dilute hydrochloric acid solution or dilute sulphuric acid under the stirring velocity of 200 ~ 400r/min, the pH value of mixing solutions is made to be 2 ~ 3, then stirring reaction 5 ~ 20min is stopped, obtained polysilicon acid solution.
4. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 1, is characterized in that, step 2) in inorganic flocculating agent be one in molysite, aluminium salt, polymeric ferric salt, polyaluminium salts or polymeric aluminum molysite or any two kinds.
5. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 4, is characterized in that, inorganic flocculating agent is iron(ic) chloride, aluminum chloride, polymerize aluminum chloride, poly-ferric chloride or aluminium iron polychloride.
6. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 1, it is characterized in that, in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid solution and inorganic flocculating agent molar ratio are 1:1 ~ 2.5 in step (3).
7. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 5, is characterized in that, in polysilicon acid solution and inorganic flocculating agent solution, polysilicon acid and inorganic flocculating agent molar ratio are 1:1 in step (3).
8. the preparation method of the sludge conditioner for deeply dehydrating sludge according to claim 1, is characterized in that, in step (3), mixing temperature is 30 ~ 38 DEG C, and in step (3), mixing time is 1 ~ 3h.
9. an application for sludge conditioner according to claim 1, for sludge dewatering, described mud is primary sludge and/secondary sludge, and the water ratio of primary sludge is more than 95%, and the water ratio of secondary sludge is 70 ~ 95%.
10. the application of sludge conditioner according to claim 9, it is characterized in that, during for sludge dewatering, method is as follows: at normal temperatures, in mud, add sludge conditioner, dosage is that every 100ml mud adds 6 ~ 12ml amendment, stirring reaction 10 ~ 60min, carries out sludge dewatering under pressure 0.05 ~ 2Mpa, and dehydration rate is 20% ~ 45%, preferably, the dosage of amendment is that every 100ml mud adds 8ml amendment.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698887A (en) * | 2016-11-21 | 2017-05-24 | 兰州大学 | Preparation method and use method of compound inorganic flocculant poly-ferric aluminum sulfate |
| CN107935154A (en) * | 2018-01-12 | 2018-04-20 | 常州华禹环保科技有限公司 | Compound metal ion flocculant and preparation method thereof |
| CN110526550A (en) * | 2019-08-21 | 2019-12-03 | 北京首创污泥处置技术有限公司 | A kind of deep dehydration medicament for solid phase sludge |
| CN111718104A (en) * | 2020-06-19 | 2020-09-29 | 中碳(上海)科技有限公司 | Polysilicate iron chemical conditioner and preparation method thereof |
| CN112174488A (en) * | 2020-09-25 | 2021-01-05 | 北京环球中科水务科技有限公司 | Inorganic polymer sludge conditioner and preparation method and application thereof |
| CN112174489A (en) * | 2020-09-25 | 2021-01-05 | 北京环球中科水务科技有限公司 | Inorganic polymer sludge conditioner and preparation method and application thereof |
| CN112299681A (en) * | 2020-09-03 | 2021-02-02 | 西南石油大学 | Preparation method of water-based mud/drilling cuttings drying agent |
| CN113735399A (en) * | 2021-09-15 | 2021-12-03 | 北控(秦皇岛)水务有限责任公司 | Anaerobic digestion treatment method for municipal sludge |
| CN113880395A (en) * | 2021-08-31 | 2022-01-04 | 海环绿源环保科技(上海)有限公司 | Sludge dewatering complexing agent and sludge dewatering method |
| CN114751623A (en) * | 2022-06-15 | 2022-07-15 | 北京环球中科水务科技股份有限公司 | Sludge dewatering conditioner and sludge dewatering method |
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| CN106698887B (en) * | 2016-11-21 | 2019-11-22 | 兰州大学 | A kind of preparation method and its application method of composite inorganic flocculant poly aluminium sulfate iron |
| CN106698887A (en) * | 2016-11-21 | 2017-05-24 | 兰州大学 | Preparation method and use method of compound inorganic flocculant poly-ferric aluminum sulfate |
| CN107935154A (en) * | 2018-01-12 | 2018-04-20 | 常州华禹环保科技有限公司 | Compound metal ion flocculant and preparation method thereof |
| CN110526550A (en) * | 2019-08-21 | 2019-12-03 | 北京首创污泥处置技术有限公司 | A kind of deep dehydration medicament for solid phase sludge |
| CN111718104A (en) * | 2020-06-19 | 2020-09-29 | 中碳(上海)科技有限公司 | Polysilicate iron chemical conditioner and preparation method thereof |
| CN112299681A (en) * | 2020-09-03 | 2021-02-02 | 西南石油大学 | Preparation method of water-based mud/drilling cuttings drying agent |
| CN112299681B (en) * | 2020-09-03 | 2022-06-17 | 西南石油大学 | Preparation method of water-based mud/drilling cuttings drying agent |
| CN112174489B (en) * | 2020-09-25 | 2022-10-18 | 北京环球中科水务科技有限公司 | Inorganic polymer sludge conditioner and preparation method and application thereof |
| CN112174489A (en) * | 2020-09-25 | 2021-01-05 | 北京环球中科水务科技有限公司 | Inorganic polymer sludge conditioner and preparation method and application thereof |
| CN112174488A (en) * | 2020-09-25 | 2021-01-05 | 北京环球中科水务科技有限公司 | Inorganic polymer sludge conditioner and preparation method and application thereof |
| CN112174488B (en) * | 2020-09-25 | 2022-10-21 | 北京环球中科水务科技有限公司 | Inorganic polymer sludge conditioner and preparation method and application thereof |
| CN113880395A (en) * | 2021-08-31 | 2022-01-04 | 海环绿源环保科技(上海)有限公司 | Sludge dewatering complexing agent and sludge dewatering method |
| CN113880395B (en) * | 2021-08-31 | 2023-10-13 | 芜湖海创环保科技有限责任公司 | Sludge dewatering complexing agent and sludge dewatering method |
| CN113735399A (en) * | 2021-09-15 | 2021-12-03 | 北控(秦皇岛)水务有限责任公司 | Anaerobic digestion treatment method for municipal sludge |
| CN114751623A (en) * | 2022-06-15 | 2022-07-15 | 北京环球中科水务科技股份有限公司 | Sludge dewatering conditioner and sludge dewatering method |
| CN114751623B (en) * | 2022-06-15 | 2022-10-18 | 北京环球中科水务科技股份有限公司 | Sludge dewatering conditioner and sludge dewatering method |
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Application publication date: 20160323 |